Headache of pedantics going on here.
@bmaloney I understand that you've put a lot of thought and time into creating a form to collect the data you need as efficiently as possible, but I believe that what you're encountering is the fact that, as far as I know, schools are chronically understaffed concerning administrative matters. And they're understaffed in this area because of a lack of funding. Admin staff are just not viewed as important in the grand scheme of things, even though they're critical to making a school actually function.
I guess the school I work at is lucky to have me as a tech, because I willingly take on work that's not officially my responsibility. Anything the overworked and stressed admin staff cannot handle is delegated to me. For the past year or more I've assumed full responsibility over everything data protection, and that includes subject access requests.
Even if schools want to comply, the form is large and intimidating. The office staff and Head at this school were daunted by it, even though they have me available to comb through the data and complete it for them. After consulting other local Heads, whose schools were also daunted by the request (and at the time were waiting to hear back from our LA who had contacted the ICO), this Head decided they didn't want me spending the time on it when there are so many other things that need to be done. The ICO then deemed the request invalid, so I didn't have to do it. You have challenged their decision, so here I am waiting to see what the outcome is.
I get that you're frustrated at what looks like incompetence from the schools. It's true that some might be too quick to dismiss the request. But the only reason they'll be avoiding it is because they don't feel like they have the time to complete it.
The least you can do is consider schools' situations, and openly listen to their feedback. Friendliness and co-operation goes a long way to achieving results, rather than being defensive and taking everything personally. Don't try telling schools how you think they should be running or doing things if you only have an outside perspective. I too get frustrated at fumbling inefficiency, and what looks like people avoiding responsibilities/workload, (and I have an inside view), but I also understand why things come across as they do. The 3 years I've been working in education have opened my eyes a lot and taught me to be a little more patient and considerate.